Alphys is a character from the indie video game Undertale, created by Toby Fox. She is a small, yellow dinosaur-like monster who serves as the royal scientist in the underground world. Alphys is known for her intelligence and expertise in technology, particularly in creating various inventions and experiments. In the game, Alphys is portrayed as shy and socially awkward, often struggling with her self-esteem. She has a deep admiration for anime and often references it throughout the story. Alphys plays a significant role in the game's narrative, particularly in relation to the character Undyne and the overarching themes of friendship and acceptance.